How Ground Screws Work
Ground screws — also known as screw piles or helical piles — are a structural foundation system that eliminates the need for concrete. This guide explains how they work, why they perform reliably and when they are the right choice for your project.
For nationwide ground screw installation, pricing, applications and technical resources, visit Forti Nova's dedicated Ground Screws UK specialist hub.
What Is a Ground Screw?
A ground screw is a structural steel pile with a helical plate welded to its lower section. It is installed into the ground by rotating it under hydraulic torque, driving the helical plate down through the soil without any excavation.
Ground screws are typically manufactured from galvanised structural steel. Corrosion protection and expected service life depend on the selected product, coating specification, soil chemistry and project requirements, so the current manufacturer documentation should be checked for the job.
Once installed, the screw provides a stable vertical load-bearing point. A steel bracket or bearing plate at the top allows it to be connected directly to the structural frame of the building — whether that is a steel frame garden room, decking subframe or modular building.
The Installation Process — Step by Step
Site Assessment
Ground conditions are assessed and the correct screw diameter, length and spacing are specified for the structural loads of your building. Underground utilities are scanned and drain tracing is completed before any work begins.
Screw Layout Marked
The precise installation positions are marked on site, coordinated with the structural frame specification. For steel frame garden rooms, positions align exactly with the frame's load points.
Hydraulic Installation
Each screw is driven into the ground using specialist hydraulic torque machinery. As the helical plate rotates, it compresses the soil around it — anchoring the pile without any excavation or digging.
Depth & Alignment Monitored
Installation depth and alignment are monitored throughout. On suitable sloping sites, screw projection or bracket levels can be coordinated with the structural design to reduce the amount of conventional groundwork required.
Installation Data Checked
Installation torque can provide useful evidence about the ground response and may form part of the verification process. Acceptance criteria, load correlations and any testing requirements must follow the screw system, structural design and project specification.
Handover for the Next Stage
Ground screws do not need concrete curing time. Construction can proceed once the installed foundation has been checked and accepted against the project requirements, including any specified records, testing or engineering sign-off.
Why Torque Verification Matters
Installation torque is one useful source of information during ground screw installation because it records the resistance encountered as the screw advances through the ground.
For systems with a validated torque-to-capacity relationship, that installation data may contribute to verification of the installed foundation. It should not be treated as a universal stand-alone load test: screw geometry, soil conditions, design assumptions and the system's documented correlation all matter.
Forti Nova can record installation information and coordinate the project documentation required for the agreed scope. Where engineering calculations, testing or certification are required, the exact deliverables and responsible engineer are confirmed for the individual project.
Every Installation Includes
How Ground Screws Compare to Concrete
Traditional concrete foundations commonly involve excavation, formwork and a curing period. A suitable ground screw design can reduce excavation and removes the concrete curing stage, which can simplify the programme on appropriate garden-room and modular projects.
Ground screws can also be removable in suitable conditions. Whether they can be recovered cleanly depends on the screw, ground conditions, access, structure and removal method.
What Ground Screws Are Used For
Garden Rooms
Home Offices
Decking Structures
Modular Buildings
Extensions
Outbuildings
Frequently Asked Questions
What are ground screws used for?
Ground screws are steel foundations that are mechanically installed into the ground to support structures such as garden rooms, decking, modular buildings and extensions without the need for concrete foundations.
How much weight can ground screws support?
Load capacity depends on ground conditions and screw size, but properly installed ground screws can support substantial structural loads suitable for garden rooms, steel frames and modular buildings.
Are ground screws better than concrete?
Ground screws offer faster installation, minimal ground disturbance and load-bearing capability subject to the screw specification, ground conditions and any required verification compared to traditional concrete foundations.
Ground Screws by Location
Local supply and installation of ground screw foundations across the North West.
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Ground Screw Installation Across the North West
Forti Nova installs ground screw foundations across the North West. Customers searching for ground screws in Manchester, screw pile foundations in Preston or helical pile installation in Lancashire can speak directly to our team.
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